Black tarry stool with fever

Patient

Q: Last monday, my brother had a diarrhea with black tarry stool.. then the next day he had a fever until now at hte same time with diarrhea black tarry stool.. my question is what is the possible sickness of my brother? is this a possible sign of dengue? if yes,why should the diarrhea is the first sign rather than fever..and what is the possible cure and medicine for this.. thanks.

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